1) when does life end then? Is killing any viable cells with the potential for life a sin? (e.g. hair, skin, etc. that you wash off your body). We can take DNA from those cells and create life, so are you in fact mudering something or someone?
2) why is pleasuring yourself a sin? Should we not be allowed to scratch ourselfs if we itch, or massage a sore muscle? why is massing your clitoris or penis until orgasm any different?